Wireless-telegraph transmitter of the portable type.



A. MULRONY. WIRELESS TELEGRAPH TRANSMITTER 0F THE PORTABLE TYPE.

APPUCATION'F'ILED :uw 2a. |915.

4Patented Feb.20,1917.

MARION ALVIN MULRONY, or nANnWicK, lNEAR SYDNEY, New sourir WALES,

' AUSTRALIA WIRELESSTELEGRAPH TRNSMITTER OF THE PORTABLE TYPE.

To all whom t may concern.:

Be it known that I, MARION AnviN )InL- Roxr, a citizen of the tinted States, residing at Avoca street, Randwick, near Sydney,`

New South Viales, Australia, have invented certain new and 'useful improvements in Wireless-Telegraph Transmitters of the Portable Type, of which the following is a specification.

' usable also for obtaining current suitable for exciting Rntgen tubes and may therefore be used in emergencies for field hospital service. According to this invention the current generator is a high frequency rotary7 trans former of the inductor type adapted to be rotated by means of a geared manual crank or by means of a belt or other mechanical connection to a rotating element in an automobile or motor cycle or other convenient motor. This generator is wound to supply a. single phase high tension alternating current having 50400 cycles period and energy equivalent to 200 watts or. thereabout at a voltage of about 18000. The electrical quantities in this transformer are calculated to insure regulation by resonance, this resonance being obtained by providing adequate magnetic leakage so that reactances are not required in the external circuit under any condition between Zero and full load. A sending key is included in the primary circuit. and the secondary circuit includes external to the generator a persistent-ly oscillating circuit coupled to a freely radiating circuit. or a charging circuit associated with a freely radiating circuit excited with uiiidirectional impulses. rl`he radiator is 'an air wire adapted to be raised oit a telescopic bamboo mast.

Construction of the generator according to a particular system is essential to the successful operation of the invent-ion. '\l`his necessary system of construction will now be described briefly with reference to the accompanying drawing` in which Figure l is a perspective view showing the essential elements of the generator; and Fig.` 2 is a diagram of the current wave obtained from the generator; Fig. 3 is a, diagrammatic sketch of the operative element of the generator and of the wiring and apparatus external to the generator and constituting the oscillating and radiating circuits. Fig. et is a diagrammatic sketch showing an alternative arrangement of the external circuits.

The generator field comprises two oi' more permanent magnets A, andtwo rotary magnetic flux changing pole `armatures B and C which are fixed to the shaft F in planes at right. angles to each other. IThe transformer coils are fixed; they are located between the pole changers B and C and comprise a primary coil (G) and a secondary coil (H). One terminal of each coil is eartlied at D, most conveniently through the machine frame. The outer teiniinal of the primary passes to an automatic circuit breaker E arranged to break the primary circuit four tiines per revolution at the peak of each half of the generator wave. The circuit breaker is carried on the rotary shaft F, and the Specification of Letters Patent. Patented Feb. 20, 1917.

Application tiled July 23, 1915. Serial No. 41,449.

outer terminal .of the circuit breaker is 'l eartlied through a sending key V. A condenser K to inhibit sparking at the circuit breaker E is shunted around the circuit breaker. The design of the coils and cores is such that good regulation over the full range is obtained by :permitting electrical losses to occur through magnetic leakage.

The outer terminal of the secondary wind# ing is connected to the oscillating circuit L, (F ig. 3l the foot )l of which is earthed. In t`he oscillating circu't'eQ is a condenser, P a variable tuning inductince. and Q a spark gap. In practice, the elettric values are adjusted to produce oscillations in the radiator lhaving a length ofl 150 to 200 meters. A variable loading inductance N is inserted above or below the spark gap, in the radiator circuit. In the alternative circuit arrangement shown in Fig. i the coupling to the aerial is electrostatic through the oondenser O.

The transformer circuits may be planned nioo according to existing practice, whereby an" magnetic material, and the magnets are pro- 'rided With pole pieces between Which ther per shaft revolution so as to procure the de sired uni-directional impulses'. The transformer coils Gr H are Wound on the stationary bobbin R, and the interrupter is contained in the case S, its rotary element being carried on the shaft. The position of tWoof the permanent lield magnets is 1. The whole of the wiring is seereted'in the machine structure except to the charging or exciting circuit.

What I claim as myinvention land desire to secure by Letters Patent is 1. A 'short distance Wireless telegraph transmitter consisting of a high frequency rotary transformer of the inductor type de Copies of this patent may be obtained for shown at A Fig.

the ground Wire and the circuit Wires to the sending key and signed to secure regulation by in combination With an automaticl circuit breaker Iand a sending key in tl'epri--l leakage,

mary circuit thereof; an oscillating lexciting; circuit charged by the secondary v'circuit .of said transformer; and a tuned aerial circuit energized by said exciting circuit.

2. A short distance Wireless telegraphtransmitter, comprising a rotary transformer of the inductor vtype with means in its primary circuit forinte'rrupting flow current therein and means associated electrically With its secondary circuit for radiating Wave energy therefrom, said transformer consisting of fixed primary and secondary coils designed to permit magnetic leakage and thereby effect regulation, and located between two flux changing armatures of high permeability mountedin crossed planes on a rotary shaft in the field' of permanent magnets located ateither side of -said coils,

.and a circuit breaker on said shaft in parab lel With a condenser' in the primary circuit. In testimony whereof l have aflixed my signature in presence of two witnesses.

MARION ALVIN M'ULrzoNY.

l/Vitnesses S. BECK, W. J. DAvIs.

ve cents each, by addressing the -Coimnissioner of Iatente. washington, D. c. 1

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